supply of insulation monitoring relay 415v ac, 3 phase, neutral isolated, voltage range 0-500v ac, insulation measuring range 10k ohm to 150k ohm, control supply 24-240v ac/dc, as per item no. a-2, of rdso spec no. rdso/pe/spec/ac-0184-2015 (rev.1) & place of installation s1a7, used for insulation control 415v of lhb type ac coaches, confirming to rdso spec. no. rdso/pe/spec/ac-0184-2015 (rev.1) suitable for switch board cabinet of lhb type ac coaches. accepted make as per sr. no. 68 o rdso letter no. el/7.1.108/mssbc dated 17.09.2021.insulation monitoring relay 415v ac, 3 phase, neutral isolated, voltage range 0-500v ac, insulation measuring range 10k ohm to 150k ohm, control supply 24-240v ac/dc, as per item no. a-2, of rdso spec no. rdso/pe/spec/ac-0184-2015 (rev.1) & place of installation s1a7, used for insulation control 415v of lhb type ac coaches, confirming to rdso spec. no. rdso/pe/spec/ac-0184-2015 (rev.1) suitable for switch board cabinet of lhb type ac coaches. accepted make as per sr. no. 68 o rdso letter no. el/7.1.108/mssbc dated 17.09.2021.,insulation monitoring relay 415v ac, 3 phase, neutral isolated, voltage ran ge 0-500v ac, insulation measuring range 10k ohm to 150k ohm, control supply 24-240v a c/dc, as per item no. a-2, of rdso spec no. rdso/pe/spec/ac-0184-2015 (rev.1) & place of ins tallation s1a7, used for insulation control 415v of lhb type ac coaches, confirming to rdso spec. no. rdso/pe/spec/ac-0184-2015 (rev.1) suitable for switch board cabinet of lh b type ac coaches. accepted make as per sr. no. 68 o rdso letter no. el/7.1.108/mssbc dat ed 17.09.2021. [ warranty period: 30 months after the date of delivery ] ]